How many CSS cards can be installed on S series modular switches that constitute a CSS

CSS cards of the S7700/S9700/S9300 are installed on the MPU. Two devices must be equipped with the active and standby MPUs to meet requirements of CSS card connections. In addition, two CSS cards are installed on each device;
For the S12700, a CSS card is installed on the SFU. The number of CSS cards must be the same as that of SFUs. One S12708/S12712 supports a maximum of four cards, and the S12704 supports one or two cards. Using two or more cards is recommended.

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